-- 游戏状态
STATE_READY = 1

STATE_PLAY = 2

STATE_PAUSE = 3

-- 方向
DIRECTION_UP = 1

DIRECTION_DOWN = 2

DIRECTION_LEFT = 3

DIRECTION_RIGHT = 4

-- 边界
BORDER_MIN_X = 1

BORDER_MAX_X = 36

BORDER_MIN_Y = 1

BORDER_MAX_Y = 36